一、前言为使直线齿环面蜗杆传动获得优良的啮合性能,必须对蜗杆进行修形。实践证明当虹杆的修形曲线满足如下方程时,啮合性能为佳: (1) 式中:ψ—从蜗杆中平面算起的角座标,入口一侧取负,出口一侧取正(弧度); α_p—蜗杆包容蜗轮齿的角度之半(弧度); A—蜗轮副的设计中心距(毫米); i—蜗轮副的设计传动比; a(ψ)—任意ψ位置的修形量(毫米)。 (1)式称为全修形方程,精确地按方程(1)进行的修形称为全修形。全修形需用数控机床,或在普通机床中增加专门机构。前者一般厂家不易具备条件;后者则导致机床刚性减小,降低了机床乃至修形的精度,且使精加工蜗杆时圆周进给发生困难。故实际生产中多采用变参数修形,即通过改变机床加工蜗杆时的 I. Preface In order to obtain excellent meshing performance of the straight-tooth toroidal worm drive, the worm must be repaired. Practice has proved that when the curve of the rainbow rod to meet the following equation, the meshing performance is better: (1) Where: ψ - angular coordinates from the median plane of the worm, the entrance side to take negative, exit side take positive Radian); α_p - half of the angle of worm gear inclusive of worm gear (radian); A-design center distance of worm gear pair (mm); i- design gear ratio of worm gear pair; (Mm). (1) is called the complete repair equation, exactly according to equation (1) for the repair called full repair. Complete repair need to use CNC machine tools, or add special institutions in ordinary machine tools. The former general factory is not easy to have the conditions; the latter leads to reduce the rigidity of the machine, reducing the machine and even the accuracy of repair, and the finishing worm feed difficult circumferences. Therefore, the actual production of more variable parameters modified, that is, by changing the worm when the machine